在写程序时,显示部分很经常用到,所以一般都直接做成DRIVER,这样用到时调用就是了。下面是个动态扫描的驱动。

   先是文件头部分

+++++++LEDDRIVER.H++++++++

#ifndef _LedDriver_H_  //防止重复引用该文挡,如果没定义过符号  

                                     //_LedDriver_H_,      则编译下程序
#define _ledDriver_H_

void LedPrint(unsigned char Dat);

void LedWork(void);

void Delay(unsigned char count);

#endif

++++++LEDDRIVER.C++++
#include <REGX52.H>
#include "LedDriver.h"

code unsigned char LedCode[]=
{
 //0    1   2    3    4    5    6    7    8    9  
 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
 //A    B     C    D    E    F -    H    L    P    O
 0x77,0x7c,0x39,0x5e,0x79,0x71,0x40,0x76,0x38,0x73,0x5c
};

unsigned char DisBuf[4];

void LedPrint (unsigned char Dat)        //显示值的缓存
{
 DisBuf[0] = DisBuf[1];
 DisBuf[1] = DisBuf[2];
 DisBuf[2] = DisBuf[3];
 DisBuf[3] = Dat;
}

void LedWork(void)         //动态显示
{
 static unsigned char i=0;
 int m;

 P2 =0x0f;
 P0=LedCode[DisBuf[i]];
 switch (i)
 {
  case 0: P2_0=0; break;
  case 1: P2_1=0; break;
  case 2: P2_2=0; break;
  case 3: P2_3=0; break;
 }
 if(++i>=4)  i=0;
}

void Delay(unsigned char count)
{
 unsigned char j;

 while(count-- != 0)
 {
  for(j=0;j<72;j++);
 }
}